Vaporization core and electronic vaporization apparatus

ABSTRACT

An electronic vaporization apparatus includes a vaporization core, which includes a porous substrate and a heating element. The porous substrate includes a liquid absorbing surface and a vaporization surface. The heating element is arranged on the vaporization surface. The porous substrate includes a liquid penetration portion close to the vaporization surface, and a temporary liquid storage portion, which is a portion of a volume of the porous substrate occupied by e-liquid with a maximum vaporizable volume Qc1 in an inhalation cycle of the vaporization core. In any inhalation cycle of continuous inhalations, the vaporization core meets: Qcn≥Qxn≥Qbn, where Qcn represents a volume of e-liquid stored in the temporary liquid storage portion before an nth inhalation cycle starts, Qxn represents a volume of e-liquid actually vaporized during the nth inhalation cycle, and Qbn represents a volume of e-liquid entering the porous substrate during the nth inhalation cycle.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure claims priority to Chinese Patent Application No. 202210631709.6, filed on Jun. 6, 2022 and entitled “VAPORIZATION CORE AND ELECTRONIC VAPORIZATION APPARATUS”, which is incorporated herein by reference in its entirety.

FIELD

The present disclosure relates to the field of electronic vaporization apparatus technologies, and in particular, to a vaporization core and an electronic vaporization apparatus.

BACKGROUND

With the improvement of tobacco consumers' own health awareness and the development of the international tobacco control movement, electronic cigarettes are increasingly popular with consumers. A key device in an electronic cigarette is a vaporization core, and the vaporization core generally includes a porous substrate and a heating element arranged on the porous substrate. When a consumer inhales the electronic cigarette, the porous substrate absorbs e-liquid to the heating element, and under the action of electronic heating of the heating element, the e-liquid may be heated and vaporized to generate vapor. At present, the phenomenon of “e-liquid leakage” or “burnt core” is common in commercially available electronic cigarettes. This seriously affects the use experience of users.

SUMMARY

In view of the foregoing problems, the present disclosure provides a vaporization core and an electronic vaporization apparatus. The vaporization core can be used in a plurality of continuous inhalation cycles without e-liquid explosion and burnt core.

A first aspect of the present disclosure provides a vaporization core. The vaporization core includes a porous substrate and a heating element, where the porous substrate includes a liquid absorbing surface and a vaporization surface, and the heating element is arranged on the vaporization surface. The porous substrate is defined to include a liquid penetration portion and a temporary liquid storage portion that are connected, the temporary liquid storage portion is close to the vaporization surface and the temporary liquid storage portion is a portion of a volume of the porous substrate occupied by e-liquid with a maximum vaporizable volume Q_(c1) in an inhalation cycle of the vaporization core.

Q _(c1) =V×σ  (1)

In any inhalation cycle of continuous inhalations, the vaporization core meets:

$\begin{matrix} {Q_{cn} \geq Q_{xn} \geq Q_{bn}} & (2) \end{matrix}$ $\begin{matrix} {{{{When}n} \geq 2},{Q_{cn} = {Q_{cl} - {\sum\limits_{i = 1}^{n - 1}\frac{f\left( T_{i} \right)}{\rho}} + {{v_{b}(h)} \times {S(h)} \times \left( {{\sum\limits_{i = 1}^{n - 1}T_{i}} + {\sum\limits_{i = 1}^{n - 1}t_{i}}} \right) \times \sigma}}}} & (3) \end{matrix}$

V is a volume of the temporary liquid storage portion, in units of cm³; σ is a porosity of the porous substrate; Q_(cn) represents a volume of e-liquid stored in the temporary liquid storage portion before an n^(th) inhalation cycle starts, Q_(xn) represents a volume of e-liquid actually vaporized during the n^(th) inhalation cycle, and Q_(bn) represents a volume of e-liquid entering the porous substrate during the n^(th) inhalation cycle, where units of Q_(cn), Q_(c1), Q_(xn) and Q_(bn) are all mL; is any integer ranging from 1 to n; f(T) represents a function relationship between quality of e-liquid actually vaporized and an inhalation time in an i^(th) inhalation cycle; T_(i) is a duration of the i^(th) inhalation cycle, in units of s; t Z is an interval time between the i^(th) inhalation cycle and an (i+1)^(th) inhalation cycle, in units of s; v_(b)(h) is a penetration rate of e-liquid in the porous substrate at a distance h from the vaporization surface, in units of cm/s; and S(h) is a cross-sectional area of the porous substrate at a distance h from the vaporization surface, in units of cm².

During a plurality of continuous inhalation cycles of the foregoing vaporization core, the volume Q_(cn) of e-liquid stored in the temporary liquid storage portion, the volume Q_(xn) of e-liquid consumed by vaporization on the vaporization surface, and the volume Q_(bn) of e-liquid entering the vaporization core can always meet the foregoing relationship, so that there is always an appropriate amount of e-liquid in the vaporization core. This can effectively avoid the phenomenon of burnt core and e-liquid explosion during a plurality of continuous inhalation cycles, so as to significantly improve the use experience of consumers.

A second aspect of the present disclosure provides an electronic vaporization apparatus, where the electronic vaporization apparatus has the vaporization core according to the first aspect of the present disclosure and a battery connected to the vaporization core (100).

The inventor of the present disclosure finds in a research process that excessively large e-liquid content in a porous substrate will easily lead to “e-liquid explosion” to cause serious e-liquid leakage, or excessively small e-liquid content in the porous substrate may cause the phenomenon of “burnt core”, and consequently vapor has a burnt flavor.

However, when the electronic vaporization apparatus of the present disclosure works, by controlling the relationship between the volume of e-liquid stored in the temporary liquid storage portion, the volume of e-liquid actually vaporized during a single inhalation cycle, and the volume of e-liquid entering the porous substrate (10) during a single inhalation cycle to be in an appropriate range, the electronic vaporization apparatus can work continuously for a plurality of inhalation cycles without a burnt core and e-liquid explosion, so that the use experience of users is good, and a service life of the electronic vaporization apparatus is long. In addition, vapor generated by the electronic vaporization apparatus has a good taste and high fullness.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a vaporization core according to an embodiment of the present disclosure;

FIG. 2 is a grayscale image from a perspective of a vaporization core according to Embodiment 1 of the present disclosure;

FIG. 3 is a vaporization quality-time function curve of e-liquid of a vaporization core measured in Embodiment 1 of the present disclosure; and

FIG. 4 is a grayscale image of a vaporization core from a perspective of a vaporization core according to Embodiment 3 of the present disclosure.

DETAILED DESCRIPTION

At present, most of electronic vaporization apparatuses on the market have the problems of “e-liquid explosion” and “burnt core”. The “e-liquid explosion” is due to accumulation of excessive e-liquid on a vaporization surface in a short time. This causes the e-liquid on the vaporization surface to be overboiled during heating, and sound similar to “oil explosion” sound that is generated when water drops into a deep fryer occurs. In addition, when “e-liquid explosion” happens, extra e-liquid will splash into a vaporization cavity of the electronic vaporization apparatus, causing e-liquid to accumulate in the vaporization cavity, which seriously affects the use experience of consumers and causes waste of e-liquid. The “burnt core” is due to dry heating of a heating element on the vaporization surface. This produces a burnt smell and will also seriously affect the use experience of consumers. To resolve the foregoing problem, an embodiment of the present disclosure provides a vaporization core.

Specifically, the following describes the technical solutions of the present disclosure in detail with reference to the accompanying drawings.

Referring to FIG. 1 , the vaporization core 100 includes a porous substrate 10 and a heating element 20, where the porous substrate 10 includes a liquid absorbing surface 101 and a vaporization surface 102, and the heating element 20 is arranged on the vaporization surface 102. The porous substrate 10 is defined to include a liquid penetration portion 103 and a temporary liquid storage portion 104. The liquid penetration portion 103 and the temporary liquid storage portion 104 are connected, the temporary liquid storage portion 104 is close to the vaporization surface 102 and the temporary liquid storage portion 104 is a portion of a volume of the porous substrate 10 occupied by e-liquid with a maximum vaporizable volume Q_(c1) in an inhalation cycle of the vaporization core 100.

Q _(c1) =V×σ  (1)

In any inhalation cycle of continuous inhalations, the vaporization core 100 meets:

$\begin{matrix} {Q_{cn} \geq Q_{xn} \geq Q_{bn}} & (2) \end{matrix}$ $\begin{matrix} {{{{When}n} \geq 2},{Q_{cn} = {Q_{cl} - {\sum\limits_{i = 1}^{n - 1}\frac{f\left( T_{i} \right)}{\rho}} + {{v_{b}(h)} \times {S(h)} \times \left( {{\sum\limits_{i = 1}^{n - 1}T_{i}} + {\sum\limits_{i = 1}^{n - 1}t_{i}}} \right) \times \sigma}}}} & (3) \end{matrix}$

V is a volume of the temporary liquid storage portion 104, in units of cm³: σ is a porosity of the porous substrate 10; Q_(cn) represents a volume of e-liquid stored in the temporary liquid storage portion 104 before an n^(th) inhalation cycle starts, Q_(xn) represents a volume of e-liquid actually vaporized during the n^(th) inhalation cycle, and Q_(bn) represents a volume of e-liquid entering the porous substrate 10 during the n^(th) inhalation cycle, where units of Q_(cn), Q_(xn) and Q_(bn) are all mL; i is any integer ranging from 1 to n; f(T_(i)) represents a function relationship between quality of e-liquid actually vaporized and an inhalation time in an i^(th) inhalation cycle; T_(i) is a duration of the i^(th) inhalation cycle, in units of s; t_(i) is an interval time between the i^(th) inhalation cycle and an (i+l)^(th) inhalation cycle, in units of s; v_(b)(h) is a penetration rate of e-liquid in the porous substrate 10 at a distance h from the vaporization surface 102, in units of cm/s; and S(h) is a cross-sectional area of the porous substrate 10 at a distance h from the vaporization surface 102, in units of cm².

It should be noted that, all the e-liquid vaporized during the i^(th) inhalation cycle comes from the e-liquid that has been stored in the temporary liquid storage portion 104 before the i^(th) inhalation, and the e-liquid entering the porous substrate 10 during the i^(th) inhalation cycle will be vaporized in the (i+1)^(th) inhalation cycle.

The following describes definitions of the temporary liquid storage portion 104 and Q_(c1) in detail:

A portion of a volume of the porous substrate 10 occupied by e-liquid with a maximum vaporizable volume Q_(c1) in an inhalation cycle of the vaporization core 100 is defined as the temporary liquid storage portion 104. That is, e-liquid with a maximum vaporizable volume in one inhalation is located on an upper liquid surface in the vaporization core 100, and an entire space encircled by a plane at a distance h_(d) from the upper liquid surface to the vaporization surface 102, the vaporization surface 102, and a part of side walls of the porous substrate 10 is the temporary liquid storage portion 104 (that is, a height of the temporary liquid storage portion is h_(d), and reference may be made to FIG. 1 ). Naturally, an entire space encircled by a plane of the upper liquid surface of the e-liquid, the liquid absorbing surface 101, and a part of side walls of the porous substrate 10 is the liquid penetration portion 103.

It may be understood that, for each vaporization core, a value of Q_(c1) is fixed. In addition, the volume of the temporary liquid storage portion 104 may be calculated by a mathematical formula according to a value of h_(d) and a structural feature of the vaporization core. It may be understood that a critical condition for burnt core is that: During a single inhalation, the maximum vaporizable volume Q_(c1) of the e-liquid in the temporary liquid storage portion 104 is equal to a volume Q′_(x1) of e-liquid actually consumed by the inhalation, that is, a position of a liquid surface of the e-liquid when the single inhalation ends exactly overlaps with the vaporization surface 102. If Q_(c1) is less than Q′_(x1), burnt core occurs.

Therefore, assuming that burnt core occurs when inhalation is continuously and uniformly performed for T_(h), a height at the vaporization surface 102 is recorded as 0:

h _(d)=∫₀ ^(T) ^(s) v _(b)(h)dt  (4)

and

Q _(c1) =V×σ=Q′ _(x1)  (5)

In the foregoing relational expressions, v_(b)(h) refers to a penetration rate of the e-liquid in the porous substrate 10 at a height h from the vaporization surface 102, which is closely related to e-liquid viscosity, a temperature of the e-liquid in the porous substrate 10, and a porous structure (pore size distribution and a porosity σ) of the porous substrate 10, and can be measured by an e-liquid penetration experiment of the vaporization core. In addition, for an existing vaporization core, σ is a known parameter, or σ may also be measured by experiments.

Moreover, Q_(c1) at this time is equal to Q′_(x1), Q′_(x1) may be calculated by a function relationship between the quality of the e-liquid actually vaporized and the inhalation time T_(h). The foregoing function relationship may also be measured by early-stage experiments, values of T_(h) and ha may be calculated with reference to formula (4) and formula (5), so as to determine the maximum vaporizable volume Q_(c1) of the e-liquid in an inhalation cycle and the volume V of the temporary liquid storage portion 104.

It may be understood that when n≥2, Q_(cn) is an amount of e-liquid stored in the temporary liquid storage portion 104 after the vaporization core 100 works continuously for (n−1) cycles, that is, formula (3) may be obtained by adding the total volume Q_(c1) of the e-liquid in the temporary liquid storage portion 104 before a first cycle starts and a total volume

${v_{b}(j)} \times {S(h)} \times \left( {{\sum\limits_{i = 1}^{n - 1}T_{i}} + {\sum\limits_{i = 1}^{n - 1}t_{i}}} \right) \times \sigma$

of e-liquid entering the porous substrate during the (n−1) cycles (during the interval time period ti between two adjacent inhalation cycles, due to the action of inertia, some e-liquid is also inhaled into the porous substrate 10), and reducing a total volume

$\sum\limits_{i = 1}^{n}Q_{xi}$

of e-liquid actually vaporized during the (n−1) cycles:

${{{When}n} \geq 2},{Q_{cn} = {Q_{cl} - {\sum\limits_{i = 1}^{n - 1}\frac{f\left( T_{i} \right)}{\rho}} + {{v_{b}(h)} \times {S(h)} \times \left( {{\sum\limits_{i = 1}^{n - 1}T_{i}} + {\sum\limits_{i = 1}^{n - 1}t_{i}}} \right) \times \sigma}}}$

E-liquid entering the porous substrate 10 during an i^(th) inhalation cycle will be vaporized during an (i+1)^(th) inhalation cycle. It may be understood that, a critical condition for “e-liquid explosion” occurring in the vaporization core 100 is that:

A volume Q′_(b1) of the e-liquid entering the porous substrate 10 is equal to the total volume Q′_(x1) of the e-liquid actually vaporized. After the inhalation cycle ends, a total volume of e-liquid in the vaporization core 100 is Q_(c1)−Q′_(x1)+Q′_(b1), and this value is equal to the capacity Q_(c1) of the temporary liquid storage portion 104. If Q′_(x1)<Q′_(b1), then Q_(c2)>Q_(c1). In this case, e-liquid will overflow to the liquid penetration portion 103. However, excessive e-liquid inside the porous substrate 10 will cause the e-liquid to accumulate on the vaporization surface 102 in a short time, resulting in “e-liquid explosion”. Therefore, in order to ensure that e-liquid explosion will not occur in the vaporization core 100 in any cycle in a plurality of continuous inhalation cycles, it is necessary to meet Q_(xn)≥Q_(bn).

In summary, before each inhalation cycle starts, the temporary liquid storage portion 104 is controlled to contain a sufficient amount of e-liquid, so that the volume Q_(xn) of e-liquid vaporized in each inhalation is less than or equal to the volume Q_(cn) of the e-liquid stored in the temporary liquid storage portion 104. This can effectively avoid the phenomenon of “burnt core”. By controlling the volume Q_(xn) of e-liquid entering the vaporization core 100 in each inhalation to range from Q_(bn) to Q_(cn), it may be ensured that there is a sufficient amount of e-liquid in the temporary liquid storage portion 104 before a next inhalation cycle starts, and there will be no phenomenon of “e-liquid explosion” caused by extra e-liquid penetrating into the vaporization surface 102 in a short time, thereby significantly improving the use experience of consumers. In addition, a service life of the vaporization core 100 can further be prolonged.

In some implementations of the present disclosure, Q_(bn) meets the following relational expression: Q_(bn)=v_(b)(h)×S(h)×T_(n)×σ (formula 6); where v_(b)(h) is a penetration rate of e-liquid in the porous substrate 10 at a distance h from the vaporization surface 102, in units of cm/s; and S(h) is a cross-sectional area of the porous substrate 10 at a distance h from the vaporization surface 102, in units of cm².

In some implementations of the present disclosure, Q_(xn) meets the following relational expression:

${Q_{xn} = \frac{f\left( T_{n} \right)}{\rho}};$

where f(T_(n)) represents a function relationship between quality of vaporized e-liquid and an inhalation time, p is a density of the e-liquid, in units of mg/mL. f(T_(n)) may be measured through early-stage experiments. In some cases, the quality of the e-liquid actually vaporized by the vaporization core at different time points is measured to obtain a relationship curve between the quality of the e-liquid actually vaporized and a time. A function relationship of f(T_(n)) may be calculated by function fitting. Then, and the density of the used e-liquid is substituted, to calculate Q_(xn) of the vaporization core 100.

In some implementations of the present disclosure, t₁ meets the following relational expression:

$t_{i} \leq {\frac{Q_{cn} - Q_{xn} + Q_{bn}}{v_{b}(h)}.}$

Generally, if a user continuously performs inhalation, a duration of a single inhalation generally ranges from 2.0 s to 2.5 s, and an interval time between two adjacent inhalations generally requires a specific duration, for example, falling within a range of greater than 0 s and less than or equal to 1 s. By limiting t_(i) to be within the foregoing range, it is convenient to define whether a plurality inhalation actions performed by the user are continuous inhalations.

In some implementations of the present disclosure, t_(i) is less than or equal to 0.6 s.

In some implementations of the present disclosure, T_(i) is less than or equal to 3 s. Generally, when a consumer uses an electronic vaporization apparatus to inhales e-liquid, a single inhalation time needs to be not greater than 3 s to obtain a comfortable use experience.

In some implementations of the present disclosure, n is less than or equal to 15. In this case, the vaporization core 100 will not encounter the phenomenon of burnt core in no more than 15 continuous inhalation cycles.

In some specific embodiments, when the duration of each inhalation cycle is 3 s, the interval time between every two adjacent inhalation cycles is 0.6 s, and when inhalation is continuously performed for 15 cycles, the vaporization core 100 will not encounter the phenomenon of burnt core and e-liquid explosion.

In some implementations of the present disclosure, the porosity σ of the porous substrate 10 ranges from 40% to 60%. For example, the porosity of the porous substrate 10 may be 40%, 45%, 50%, 55%, or 60%. By controlling the porosity of the porous substrate 10, not only the total volume of the e-liquid entering the porous substrate 10 during each inhalation cycle may be directly controlled, but also a transmission rate of the e-liquid in the liquid penetration portion 103 and the temporary liquid storage portion 104 may be changed, so that Q_(bn) of the vaporization core 100 may be further controlled to be in a suitable range, and the e-liquid can be transmitted to the vaporization surface 102 faster and better, thereby achieving a fast and excellent vaporization effect and ensuring that the vaporization core 100 does not encounter burnt core and e-liquid explosion.

In some specific embodiments, the porosity σ of each part inside the porous substrate 10 may be the same or different. This parameter may be determined according to a shape and a size of the porous substrate and an actual use requirement.

In some implementations of the present disclosure, the volume V of the temporary liquid storage portion 104 ranges from 0.01 cm³ to 0.2 cm³. In some specific embodiments, V ranges from 0.01 cm³ to 0.1 cm³. For example, V may be 0.01 cm³, 0.02 cm³, cm³, 0.04 cm³, 0.05 cm³, 0.1 cm³, 0.15 cm³, or 0.2 cm³. By controlling each size of the porous substrate 10 and the porous structure and distribution of the porous substrate 10, V may be controlled in the foregoing range, thereby ensuring that a suitable amount of e-liquid may be provided by the vaporization core 100 during each inhalation cycle for vaporization and ensuring that there is no burnt core and e-liquid explosion, so as to improve the inhalation experience of users.

In some implementations of the present disclosure, Q_(c1) ranges from 0.004 cm³ to cm³. In some specific embodiments, Q_(c1) ranges from 0.004 cm³ to 0.06 cm³. For example, Q_(c1) may be 0.004 cm³, 0.005 cm³, 0.006 cm³, 0.007 cm³, 0.008 cm³, 0.009 cm³, 0.01 cm³, 0.05 cm³, 0.06 cm³, 0.07 cm³, 0.08 cm³, 0.09 cm³, 0.1 cm³, or 0.12 cm³. Controlling Q_(c1) in the foregoing range helps control the vaporization core 100 to provide a suitable amount of e-liquid during each inhalation cycle, so that a user can obtain a good use experience.

In some implementations of the present disclosure, the penetration rate v_(b)(h) of the e-liquid in the porous substrate 10 at the distance h from the vaporization surface 102 ranges from 0.01 cm/s to 0.2 cm/s. In some specific embodiments, the penetration rate v_(b)(h) of the e-liquid in the porous substrate 10 at the distance h from the vaporization surface 102 ranges from cm/s to 0.1 cm/s. For example, v_(b)(h) may be 0.01 cm/s, 0.02 cm/s, 0.03 cm/s, 0.04 cm/s, cm/s, 0.1 cm/s, 0.15 cm/s, or 0.2 cm/s. Controlling the penetration rate v_(b)(h) of each part of the porous substrate 10 in the foregoing range helps control the total volume Q_(bn) of the e-liquid entering the porous substrate 10 in each inhalation cycle to be in a suitable range and helps ensure a suitable transmission rate of the e-liquid in the porous substrate 10, so that the e-liquid may enter the temporary liquid storage portion 104 within an expected time, thereby ensuring that the vaporization core 100 does not encounter e-liquid explosion and burnt core during a plurality of continuous inhalation cycles and helping convert the e-liquid into vapor with a delicate taste, so as to improve the inhalation experience of users.

In the present disclosure, v_(b)(h) of the porous substrate 10 at different heights h from the vaporization surface 102 may be the same or different. v_(b) (h) may gradually decrease in a penetration direction of the e-liquid, or may first remain unchanged and then decrease, or may be changed in gradient.

In some implementations of the present disclosure, the liquid absorbing surface (101) and the vaporization surface (102) are arranged opposite to each other, and in a direction perpendicular to an extension direction from the liquid absorbing surface (101) to the vaporization surface (102), a maximum cross-sectional area of the liquid penetration portion 103 is smaller than a maximum cross-sectional area of the temporary liquid storage portion 104. The maximum cross-sectional area of the liquid penetration portion 103 is smaller than the maximum cross-sectional area of the temporary liquid storage portion 104. This helps further control the volume of the e-liquid entering the temporary liquid storage portion 104 from the liquid penetration portion 103 per unit time, thereby better avoiding the phenomenon of “e-liquid explosion”.

In some implementations of the present disclosure, in the direction perpendicular to the extension direction from the liquid absorbing surface (101) to the vaporization surface (102), the porous substrate (10) includes a cross-section, and a cross-sectional area of the porous substrate 10 first remains unchanged and then increases in the extension direction from the liquid absorbing surface 101 to the vaporization surface 102. In this case, a longitudinal section of the porous substrate (the longitudinal section is parallel to the extension direction from the liquid absorbing surface 101 to the vaporization surface 102 of the porous substrate) is in a “step shape”. This helps control the e-liquid in the temporary liquid storage portion 104 to continuously and uniformly penetrate onto the vaporization surface 102, so that a consumer can obtain a better use experience.

In some implementations of the present disclosure, in the direction perpendicular to the extension direction from the liquid absorbing surface (101) to the vaporization surface (102), the porous substrate (10) includes a cross-section, and the cross-sectional area of the porous substrate 10 gradually increases in the extension direction from the liquid absorbing surface 101 to the vaporization surface 102. In this case, a shape of the porous substrate 10 may be a prism. This can also help control the e-liquid in the temporary liquid storage portion 104 to continuously and uniformly penetrate onto the vaporization surface 102, so that a consumer can obtain a better use experience.

In the present disclosure, a shape of the longitudinal section of the porous substrate (the longitudinal section is parallel to the extension direction from the liquid absorbing surface 101 to the vaporization surface 102 of the porous substrate 10) may be an inverted “T”, a trapezoid, or an irregular pattern including a plurality of trapezoids or rectangles, a side wall of the porous substrate 10 (which refers to a portion of the porous substrate 10 between the liquid absorbing surface 101 and the vaporization surface 102, and the side wall connects the liquid absorbing surface 101 to the vaporization surface 102) may be a plane or a curved surface, and shapes of the liquid absorbing surface 101 and the vaporization surface 102 are not specifically limited. The liquid absorbing surface 101 and the vaporization surface 102 may be arranged opposite to each other. A person skilled in the art may select according to an actual production requirement.

In some implementations of the present disclosure, the heating element 20 includes, but is not limited to, any one of a heating film, a heating sheet, a heating circuit, or a heating net.

In some implementations of the present disclosure, a material of the porous substrate 10 includes, but is not limited to, at least one of a porous ceramic and an e-liquid guiding cotton. The porous substrate 10 may be a porous ceramic, or the porous substrate 10 may be an e-liquid guiding cotton, or the porous substrate 10 is formed by a porous ceramic and an e-liquid guiding cotton together.

An embodiment of the present disclosure further provides an electronic vaporization apparatus, where the electronic vaporization apparatus has the vaporization core 100 according to the embodiments of the present disclosure and a battery connected to the vaporization core (100).

When the electronic vaporization apparatus works, e-liquid is led onto the heating element arranged on the electronic vaporization apparatus through the porous substrate, and vapor may be evaporated when the heating element heats the e-liquid. Due to the use of the foregoing vaporization core, when the electronic vaporization apparatus works for a plurality of inhalation cycles, there is no burnt core and e-liquid explosion, so that a user has a good use experience, and a service life of the electronic vaporization apparatus is long. In addition, the vapor generated by the electronic vaporization apparatus has a good taste and high fullness.

The following describes in detail the technical solutions of the present disclosure with reference to specific embodiments.

Embodiment 1

Embodiment 1 provides a vaporization core, and for a grayscale image from a perspective of the vaporization core, reference may be made to FIG. 2 .

The vaporization core is in a shape of an inverted T, which includes a liquid absorbing surface and a vaporization surface that are arranged opposite to each other, and a heating element is arranged on the vaporization surface. The liquid absorbing surface is arranged on an upper surface of a porous substrate (a surface with a small maximum cross-sectional size, where the cross-section is a cross-section perpendicular to an extension direction from the liquid absorbing surface to the vaporization surface), and the vaporization surface is arranged on a lower surface of the porous substrate (a surface with a large maximum cross-sectional size, where the cross-section is a cross-section perpendicular to the extension direction from the liquid absorbing surface to the vaporization surface). The vaporization core includes a temporary liquid storage portion with a volume of V (the temporary liquid storage portion is an entire space encircled by a plane at a distance h_(d) from the vaporization surface, the vaporization surface, and a side wall of the porous substrate, and a liquid penetration portion is a portion of the porous substrate excluding the temporary liquid storage portion). That is, a volume of the porous substrate occupied by e-liquid with a maximum vaporizable volume Q_(c1) in an inhalation cycle of the vaporization core is V. A size of the liquid absorbing surface of the vaporization core is 4.8 mm×2.2 mm, a size of the vaporization surface is 8.0 mm×3.0 mm, a thickness size h₁ of an upper rectangle is 2.5 mm, and a thickness size h₂ of a lower rectangle is 0.8 mm. The heating element is a metal heating wire arranged on the vaporization surface in a screen-printing manner. A porosity σ of the porous substrate is 58%, and a density p of the used e-liquid is 1.1 mg/mL.

A vapor inhalation collection test is carried out on the foregoing vaporization core to obtain results of the vapor inhalation collection test at different times shown in FIG. 3 . After further fitting, a function relationship between a vaporization amount of the e-liquid and an inhalation time is obtained as

$\begin{matrix} {{Q_{xn} = {\frac{f\left( T_{n} \right)}{\rho} = {\frac{0.781 \times T^{2}}{1.1} = {0.71T^{2}}}}},} & \left( {{formula}7} \right) \end{matrix}$

and a penetration rate of the e-liquid in the porous substrate is measured according to an e-liquid penetration test as 2.8×10⁻² cm/s. In addition, a critical condition of burnt core is that: A position of a liquid surface of e-liquid when a single inhalation ends exactly overlaps with the vaporization surface. That is, assuming that burnt core occurs when inhalation is continuously and uniformly for T_(h), a height at the vaporization surface 102 is recorded as 0:

Q _(c1) =V×σ  (1)

h _(d)=∫₀ ^(T) ^(s) v _(b)(h)dt  (4)

and

Q _(c1) =V×σ=Q′ _(x1)  (5)

The measured result is respectively substituted into formulas (1), (4) and (8), then:

[8.0×3.0×0.8+(4.8×2.2)×(h _(d)−0.8)]×0.58=0.71T _(h) ²0.28×=h _(d)

It is calculated that h_(d)=1.23×10⁻¹ cm, and T_(h)=4.53 s. It may be calculated that V=21.8596×10⁻³ cm³ according to h_(d).

Then, Q_(bn)=v_(b)(h)×S(h)×T_(n)×σ (formula 6). Therefore, when a duration T of each single inhalation cycle is 3 s, the foregoing value is respectively substituted into formulas (1), (6), and (7), and Q_(c1), Q_(x1), and Q_(b1) are respectively calculated as 12.67×10⁻³ mL, 6.39×10⁻³ mL, and 5.14×10⁻³ mL, meeting Q_(c1)≥Q_(x1)≥Q_(b1).

When the vaporization core is continuously inhaled twice and an interval time t₁ between a second inhalation cycle and a first inhalation cycle is 0.6 s, the value is substituted into formula (3)

${Q_{cn} = {Q_{cl} - {\sum\limits_{i = 1}^{n - 1}\frac{f\left( T_{i} \right)}{\rho}} + {{v_{b}(h)} \times {S(h)} \times \left( {{\sum\limits_{i = 1}^{n - 1}T_{i}} + {\sum\limits_{i = 1}^{n - 1}t_{i}}} \right) \times \sigma}}},$

it is calculated that Q_(c2)=12.44×10−3 mL, and Q_(x2) and Q_(b2) are respectively 6.39×10⁻³ mL and 5.14×10⁻³ mL, also meeting Q_(c1)≥Q_(x2)≥Q_(b2).

When the vaporization core is continuously inhaled for 15 times and an interval time t14 between a 15th inhalation cycle and a 14th inhalation cycle is also 0.6 s (T₁₅=3 s, and t14=0.6 s), Q_(c15) may be calculated as 9.45×10⁻³ mL according to formula (3), and Q_(x15) and Q_(b15) are respectively calculated as 6.39×10⁻³ mL and 5.14×10⁻³ mL, meeting Q_(c15)≥Q_(x15)≥Q_(b15). Therefore, when inhalation is continuously performed for 15 times, the vaporization core still does not encounter burnt core and e-liquid explosion.

Embodiment 2

Embodiment 2 provides a vaporization core, a structural feature and a size of the vaporization core are the same as those of Embodiment 1. The porosity σ of the porous substrate is 40%, and the density p of the used e-liquid is 1.1 mg/mL.

Similarly, a vapor inhalation collection test is carried out on the foregoing vaporization core, after fitting, a function relationship between a vaporization amount of the e-liquid and an inhalation time is obtained as

${Q_{xn} = {\frac{f\left( T_{n} \right)}{\rho} = {0.5T^{2}}}},$

and a penetration rate of the e-liquid in the porous substrate is measured according to an e-liquid penetration test as 2.5×10⁻² cm/s. The measured result is respectively substituted into formulas (1), (4), and (8), then:

[8.0×3.0×0.8+(4.8×2.2)×(h _(d)−0.8)]×0.4=0.50T _(h) ²0.25×T _(h) =h _(d)

It is calculated that h_(d)=1.04×10⁻¹ cm, and T_(h)=4.17 s. That is, the temporary liquid storage portion is an entire space encircled by a plane at a height of 1.04×10⁻¹ cm from the vaporization surface, the vaporization surface, and the side wall of the porous substrate. It may be calculated that the volume of the temporary liquid storage portion V=21.7344×10⁻³ cm³ according to h_(d)=1.04×10⁻¹ cm, the duration T_(i) of each single inhalation cycle is 3 s, and Q_(c1), Q_(x1), and Q_(b1) are respectively 8.71×10⁻³ mL, 4.51×10⁻³ mL, and 3.17×10⁻³ mL, meeting Q_(c1)≥Q_(x1)≥Q_(b1).

When inhalation is continuously performed twice and the interval time t_(i) between the second inhalation cycle and the first inhalation cycle is 0.6 s, Q_(c1), Q_(x2), and Q_(b2) are respectively obtained as 8.43×10⁻³ mL, 4.51×10⁻³ mL, and 3.17×10⁻³ mL, also meeting Q_(c2)≥Q_(x2)≥Q_(b2).

When inhalation is continuously performed for 15 times (T₁₅=3 s, and t₁₄=0.60, Q_(c15), Q_(x15), and Qb₁₅ are respectively obtained as 4.84×10⁻³ mL, 4.51×10⁻³ mL, and 3.17×10⁻³ mL, meeting Q_(c15)≥Q_(x15)≥Q_(b15). Therefore, when inhalation is continuously performed for 15 times, the vaporization core still does not encounter burnt core and e-liquid explosion.

Embodiment 3

Embodiment 3 provides a vaporization core, and the vaporization core is in a shape of a prism (as shown in FIG. 4 ). The size of the liquid absorbing surface of the vaporization core is 5.0 mm×4.0 mm, the size of the vaporization surface is 10.0 mm×4.0 mm, and a thickness h of a trapezoid is 5.0 mm. The longitudinal section of the vaporization core is an isosceles trapezoid, and a width of the isosceles trapezoid at a height of h₃ is (10−h₃). The heating element is a metal heating wire arranged on the vaporization surface in a screen-printing manner. The porosity σ of the porous substrate is 58%, the density p of the used e-liquid is 1.1 mg/mL, and the penetration rate of the e-liquid in the porous substrate is 1.8×10⁻² cm/s. After fitting, a function relationship between a vaporization amount of the e-liquid and an inhalation time is obtained as

$Q_{xn} = {\frac{f\left( T_{n} \right)}{\rho} = {0.95{T^{2}.}}}$

The measured result is respectively substituted into formulas (1), (4), and (8), then:

${{\left\lbrack {\left( {10 - h_{d}} \right) + 10} \right\rbrack \times \frac{h_{d}}{2} \times 4} = {0.95T_{h}^{2}}}{{0.18T_{h}} = h_{d}}$

It is calculated that h_(d)=1.28×10⁻¹ cm, and T_(h)=7.09 s. That is, the temporary liquid storage portion is an entire space encircled by a plane at a height of 1.28×10⁻¹ cm from the vaporization surface, the vaporization surface, and the side wall of the porous substrate, and the volume of the temporary liquid storage portion V=47.8217×10⁻³ cm³. When the duration T_(i) of each single inhalation cycle is 3 s, Q_(c1), Q_(x1), and Q_(b1) are respectively calculated as 27.741×10⁻³ mL, 8.55×10⁻³ mL, and 6.26×10⁻³ mL, meeting Q_(c1)≥Q_(x1)≥Q_(b1).

When inhalation is continuously performed twice and the interval time t_(i) between the second inhalation cycle and the first inhalation cycle is 0.6 s, Q_(c2), Q_(x2), and Q_(b2) are respectively obtained as 27.61×10⁻³ mL, 8.55×10⁻³ mL, and 6.26×10⁻³ mL, also meeting Q_(c2)≥Q_(x2)≥Q_(b2).

When inhalation is continuously performed for 15 times (T₁₅=3 s, and t₁₄=0.65), Q_(c15), Q_(x15), and Q_(b15) are respectively obtained as 2597×10⁻³ mL, 8.55×10⁻³ mL, and 6.26×10⁻³ mL, meeting Q_(c15)≥Q_(x15)≥Q_(b15). Therefore, when inhalation is continuously performed for 15 times, the vaporization core still does not encounter burnt core and e-liquid explosion.

Embodiment 4

Embodiment 4 provides a vaporization core, a structural feature and a size of the vaporization core are the same as those of Embodiment 3. The porosity σ of the porous substrate is 58%, the density p of the used e-liquid is 1.1 mg/mL, and the penetration rate of the e-liquid in the porous substrate is 0.011 cm/s. After fitting, a function relationship between a vaporization amount of the e-liquid and an inhalation time is obtained as

${Q_{xn} = {\frac{f\left( T_{n} \right)}{\rho} = {0.65T^{2}}}},$

and the measured result is respectively substituted into formulas (1), (4), and (8), then:

${{\left\lbrack {\left( {10 - h_{d}} \right) + 10} \right\rbrack \times \frac{h_{d}}{2} \times 4} = {0.78T_{h}^{2}}}{{0.11T_{h}} = h_{d}}$

It is calculated that h_(d)=7.18×10⁻¹ cm, and T_(h)=6.53 s. That is, the temporary liquid storage portion is an entire space encircled by a plane at a height of 7.18×10⁻¹ cm from the vaporization surface, the vaporization surface, and the side wall of the porous substrate, and the volume of the temporary liquid storage portion V=23.168×10⁻³ cm³. When the duration T_(i) of each single inhalation cycle is 3 s, Q_(c1), Q_(x1), and Q_(b1) are respectively 16.06×10⁻³ mL, 5.85×10⁻³ mL, and 3.83×10⁻³ mL, meeting Q_(c1)≥Q_(x1)≥Q_(b1).

When inhalation is continuously performed twice and the interval time t_(i) between the second inhalation cycle and the first inhalation cycle is 0.6 s, Q_(c2), Q_(x2), and Q_(b2) are respectively obtained as 15.35×10⁻³ mL, 5.85×10⁻³ mL, and 3.83×10⁻³ mL, also meeting Q_(c2)≥Q_(x2)≥Q_(b2).

When inhalation is continuously performed for 15 times (T₁₅=3 s, and t₁₄=0.6 s), Q_(c15), Q_(x15), and Q_(b15) are respectively obtained as 6.23×10⁻³ mL, 5.85×10⁻³ mL, and 3.83×10⁻³ mL, meeting Q_(c15)≥Q_(x15)≥Q_(b15). Therefore, when inhalation is continuously performed for 15 times, the vaporization core still does not encounter burnt core and e-liquid explosion.

It should be noted that the foregoing descriptions are exemplary implementations of the present disclosure, and a person of ordinary skill in the art may make various improvements and refinements without departing from the principle of the present disclosure. All the improvements and refinements shall fall within the protection scope of the present disclosure. 

What is claimed is:
 1. A vaporization core, wherein the vaporization core comprises: a porous substrate, the porous substrate comprising a liquid absorbing surface and a vaporization surface; and a heating element, the heating element being disposed on the vaporization surface, wherein: the porous substrate comprises a liquid penetration portion and a temporary liquid storage portion, the liquid penetration portion and the temporary liquid storage portion are connected, the temporary liquid storage portion is close to the vaporization surface, and the temporary liquid storage portion is a portion of a volume of the porous substrate occupied by e-liquid with a maximum vaporizable volume Q_(c1) in an inhalation cycle of the vaporization core; wherein, Q _(c1) =V×σ  (1) in any inhalation cycle of continuous inhalations, the vaporization core meets: $\begin{matrix} {Q_{cn} \geq Q_{xn} \geq Q_{bn}} & (2) \end{matrix}$ $\begin{matrix} {{{{When}n} \geq 2},{Q_{cn} = {Q_{cl} - {\sum\limits_{i = 1}^{n - 1}\frac{f\left( T_{i} \right)}{\rho}} + {{v_{b}(h)} \times {S(h)} \times \left( {{\sum\limits_{i = 1}^{n - 1}T_{i}} + {\sum\limits_{i = 1}^{n - 1}t_{i}}} \right) \times \sigma}}}} & (3) \end{matrix}$ V is a volume of the temporary liquid storage portion, in units of cm³; σ is a porosity of the porous substrate; Q_(cn) represents a volume of e-liquid stored in the temporary liquid storage portion before an n^(th) inhalation cycle starts, Q_(xn) represents a volume of e-liquid actually vaporized during the n^(th) inhalation cycle, and Q_(bn) represents a volume of e-liquid entering the porous substrate during the n^(th) inhalation cycle, wherein units of Q_(cn), Q_(c1), Q_(xn) and Q_(bn) are all mL; i is any integer ranging from 1 to n; f(T) represents a function relationship between quality of e-liquid actually vaporized and an inhalation tune in an i^(th) inhalation cycle; T_(i) is a duration of the i^(th) inhalation cycle, in units of s; t_(i) is an interval time between the inhalation cycle and an (i+1)^(th) inhalation cycle, in units of s; v_(b)(h) is a penetration rate of e-liquid in the porous substrate at a distance h from the vaporization surface, in units of cm/s; and S(h) is a cross-sectional area of the porous substrate at a distance h from the vaporization surface, in units of cm′.
 2. The vaporization core according to claim 1, wherein Q_(bn) meets the following relational expression: Q_(bn)=v_(b)(h)×(S(h)×T_(n)×σ.
 3. The vaporization core according to claim 1, wherein Q_(xn) meets the following relational expression: ${Q_{xn} = \frac{f\left( T_{n} \right)}{\rho}},$ wherein ρ is a density of the e-liquid, in units of mg/mL.
 4. The vaporization core according to claim 1, wherein t_(i) meets the following relational expression: $t_{i} \leq {\frac{Q_{cn} - Q_{xn} + Q_{bn}}{v_{b}(h)}.}$
 5. The vaporization core according to claim 1, wherein Q_(c1) ranges from 0.004 cm³ to 0.12 cm³.
 6. The vaporization core according to claim 1, wherein σ ranges from 40% to 60%.
 7. The vaporization core according to claim 1, wherein v_(b)(h) ranges from 0.01 cm/s to 0.2 cm/s.
 8. The vaporization core according to claim 1, wherein t_(i) is less than or equal to 0.6 s.
 9. The vaporization core according to claim 1, wherein n is less than or equal to
 15. 10. The vaporization core according to claim 1, wherein T_(i) is less than or equal to 3 s.
 11. The vaporization core according to claim 1, wherein the liquid absorbing surface and the vaporization surface are arranged opposite to each other, and wherein in a direction perpendicular to an extension direction from the liquid absorbing surface to the vaporization surface, a maximum cross-sectional area of the liquid penetration portion is smaller than a maximum cross-sectional area of the temporary liquid storage portion.
 12. The vaporization core according to claim 11, wherein in the direction perpendicular to extension direction from the liquid absorbing surface to the vaporization surface, the porous substrate has a cross-section: and wherein an area of the cross-section of the porous substrate gradually increases in the extension direction from the liquid absorbing surface to the vaporization surface, or the area of the cross-section of the porous substrate first remains unchanged and then increases in the extension direction from the liquid absorbing surface to the vaporization surface.
 13. An electronic vaporization apparatus, comprising: the vaporization core according to claim 1; and a battery connected to the vaporization core. 